Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Method for preparing low-oxygen-content silicon nitride powder through low-temperature molten salt aluminothermic reduction
The invention relates to the technical field of silicon nitride ceramics, and provides a method for preparing low-oxygen-content silicon nitride powder through low-temperature molten salt aluminothermic reduction. The preparation method comprises the following steps: mixing silicon nitride powder, aluminum powder and aluminum chloride powder to obtain mixed powder; the mixed powder is subjected to low-temperature molten salt aluminothermic reduction, and reduced powder is obtained; the aluminothermic reduction temperature of the low-temperature molten salt is 180-250 DEG C; and washing and drying the reduced powder to obtain the low-oxygen-content silicon nitride powder. A low-temperature molten salt method is used, so that the aluminum powder, the silicon nitride powder and the aluminum chloride powder are subjected to a reduction reaction, and monatomic silicon and aluminum oxychloride are generated in situ; compared with traditional carbothermic reduction or silicothermic reduction, the method provided by the invention has the advantages of milder reduction conditions and lower energy consumption. When the low-oxygen-content silicon nitride powder prepared by the method is used for preparing silicon nitride ceramic, the oxygen content in the silicon nitride ceramic can be further reduced, so that the heat conductivity of the silicon nitride ceramic is improved.
本发明涉及氮化硅陶瓷技术领域，提供了一种低温熔盐铝热还原制备低氧含量氮化硅粉末的方法。本发明将氮化硅粉末、铝粉和氯化铝粉末混合，得到混合粉末；将所述混合粉末进行低温熔盐铝热还原，得到还原粉末；所述低温熔盐铝热还原的温度为180～250℃；将所述还原粉末洗涤后干燥，得到所述低氧含量氮化硅粉末。本发明使用低温熔盐法，使得铝粉、氮化硅粉和氯化铝粉发生还原反应，原位生成单质硅和氯化氧铝；与传统的碳热还原或硅热还原相比，本发明的还原条件更加温和，能耗更低。采用本发明制备的低氧含量氮化硅粉末制备氮化硅陶瓷，有利于进一步降低氮化硅陶瓷中的氧含量，从而提高氮化硅陶瓷的热导率。
Method for preparing low-oxygen-content silicon nitride powder through low-temperature molten salt aluminothermic reduction
The invention relates to the technical field of silicon nitride ceramics, and provides a method for preparing low-oxygen-content silicon nitride powder through low-temperature molten salt aluminothermic reduction. The preparation method comprises the following steps: mixing silicon nitride powder, aluminum powder and aluminum chloride powder to obtain mixed powder; the mixed powder is subjected to low-temperature molten salt aluminothermic reduction, and reduced powder is obtained; the aluminothermic reduction temperature of the low-temperature molten salt is 180-250 DEG C; and washing and drying the reduced powder to obtain the low-oxygen-content silicon nitride powder. A low-temperature molten salt method is used, so that the aluminum powder, the silicon nitride powder and the aluminum chloride powder are subjected to a reduction reaction, and monatomic silicon and aluminum oxychloride are generated in situ; compared with traditional carbothermic reduction or silicothermic reduction, the method provided by the invention has the advantages of milder reduction conditions and lower energy consumption. When the low-oxygen-content silicon nitride powder prepared by the method is used for preparing silicon nitride ceramic, the oxygen content in the silicon nitride ceramic can be further reduced, so that the heat conductivity of the silicon nitride ceramic is improved.
本发明涉及氮化硅陶瓷技术领域，提供了一种低温熔盐铝热还原制备低氧含量氮化硅粉末的方法。本发明将氮化硅粉末、铝粉和氯化铝粉末混合，得到混合粉末；将所述混合粉末进行低温熔盐铝热还原，得到还原粉末；所述低温熔盐铝热还原的温度为180～250℃；将所述还原粉末洗涤后干燥，得到所述低氧含量氮化硅粉末。本发明使用低温熔盐法，使得铝粉、氮化硅粉和氯化铝粉发生还原反应，原位生成单质硅和氯化氧铝；与传统的碳热还原或硅热还原相比，本发明的还原条件更加温和，能耗更低。采用本发明制备的低氧含量氮化硅粉末制备氮化硅陶瓷，有利于进一步降低氮化硅陶瓷中的氧含量，从而提高氮化硅陶瓷的热导率。
Method for preparing low-oxygen-content silicon nitride powder through low-temperature molten salt aluminothermic reduction
一种低温熔盐铝热还原制备低氧含量氮化硅粉末的方法
YANG PING (Autor:in) / GENG RENCONG (Autor:in) / JIA WENLEI (Autor:in) / LI MINGWEI (Autor:in) / QI WENHAN (Autor:in) / ZHOU JU (Autor:in) / ZENG YIMING (Autor:in) / HAN JIAO (Autor:in) / LI SHIQI (Autor:in)
29.10.2024
Patent
Elektronische Ressource
Chinesisch
IPC:
C04B
Kalk
,
LIME
| Europäisches Patentamt | 2024
Method for preparing CuMn alloy through aluminothermic reduction-electromagnetic casting
| Europäisches Patentamt | 2024
Aluminothermic powder boriding of steel
| British Library Online Contents | 2004
Process for preparing magnesium from dolomite by vacuum aluminothermic reduction
| British Library Online Contents | 2010
Method for preparing silicon carbide coated graphite through molten salt isolation
| Europäisches Patentamt | 2020